Radio access technology capability signaling

Abstract

A method, an apparatus, and/or a computer program product for wireless communication are provided. Radio capability signaling (RACS) optimization for the radio access technology (RAT) may be deployed for some user equipments (UEs) in a network to reduce a signaling overhead associated with identifying UE radio capabilities. The UEs may be configured with a set of UE radio capability identifiers, such as a UE radio capability identifier for a narrowband (NB) RAT, a UE radio capability identifier for a non-NB RAT, and/or the like. A UE may provide a single UE radio capability identifier corresponding to a type of RAT to which the UE is to connect. The BS may determine that the UE supports RACS optimization for the RAT. If the UE does not provide the UE radio capability identifier, the BS may infer that the UE does not support RACS optimization.

What is claimed is: 
     
       1. A method of wireless communication performed by a user equipment (UE), comprising:
 initiating a communication session establishment procedure to connect using a non-narrowband (NB) radio access technology (RAT); of a plurality of RATs, including the non-NB RAT and an NB RAT, supported by the UE, wherein the non-NB RAT corresponds to a UE radio capability identifier identified during the communication session establishment procedure; 
 determining, during signaling of the communication session establishment procedure, whether the UE supports radio capability signaling (RACS) optimization for the non-NB RAT; and 
 transmitting, during the signaling of the communication session establishment procedure, a communication session establishment message, wherein the communication session establishment message includes the UE radio capability identifier, or does not include the UE radio capability identifier, based at least in part on whether the UE supports RACS optimization for the non-NB RAT. 
 
     
     
       2. The method of  claim 1 , further comprising:
 initiating another communication session establishment procedure to connect using a second RAT; 
 determining whether the UE supports RACS optimization for the second RAT; and 
 transmitting a second UE radio capability identifier that applies to the second RAT based on at least in part on determining whether the UE supports RACS optimization for the second RAT. 
 
     
     
       3. The method of  claim 2 , wherein the UE radio capability identifier is a narrowband radio capability identifier and the second UE radio capability identifier is a wideband UE radio capability identifier. 
     
     
       4. The method of  claim 1 , wherein the UE supports narrowband access and wideband access. 
     
     
       5. The method of  claim 1 , wherein the UE radio capability identifier indicates that the UE supports:
 a plurality of non-NB RATs, associated with the UE, including the non-NB RAT, 
 a plurality of narrowband RATS, associated with the UE, including the NB RAT, or 
 a plurality of RATs, associated with the UE, including the non-NB RAT and the NB RAT. 
 
     
     
       6. The method of  claim 1 , further comprising:
 providing at least one of the UE radio capability identifier for the non-NB RAT or a second UE radio capability identifier for the NB RAT as the UE radio capability identifier. 
 
     
     
       7. The method of  claim 6 , further comprising:
 providing the UE radio capability identifier as a particular response to a query for a RAT capability of the UE. 
 
     
     
       8. The method of  claim 1 , further comprising:
 determining that the UE does not support RACS optimization for the non-NB RAT; and 
 transmitting an empty field for the UE radio capability identifier as a particular response to a query for a RAT capability of the UE. 
 
     
     
       9. The method of  claim 1 , wherein the non-NB RAT is a wideband evolved universal mobile telecommunications system (UMTS) terrestrial radio access (WB-E-UTRA) RAT or a new radio (NR) RAT. 
     
     
       10. The method of  claim 1 , wherein the NB RAT is a NB internet-of-things (IoT) RAT. 
     
     
       11. The method of  claim 1 , wherein the non-NB RAT is associated with a first network node and the NB RAT is associated with a second network node. 
     
     
       12. A method of wireless communication performed by a network node, comprising:
 initiating a communication session establishment procedure to enable a user equipment (UE), supporting a plurality of radio access technologies (RATs) including a narrowband (NB) RAT and a non-NB RAT, to connect using the non-NB RAT, wherein the non-NB RAT corresponds to a UE radio capability identifier identified during the communication session establishment procedure; 
 querying a RAT capability of the UE; 
 receiving, during signaling of the communication session establishment procedure and as a response to querying the RAT capability of the UE, a communication session establishment message,
 wherein the communication session establishment message includes the UE radio capability identifier, or does not include the UE radio capability identifier, based at least in part on whether the UE supporting radio capability signaling (RACS) optimization for the non-NB RAT; and 
 
 determining, based at least in part on a result of receiving the communication session establishment message including the UE radio capability identifier, a network capability of the UE. 
 
     
     
       13. The method of  claim 12 , wherein the UE radio capability identifier indicates a set of RATs, supported by the UE, including the non-NB RAT. 
     
     
       14. The method of  claim 12 , further comprising:
 receiving the UE radio capability identifier as a particular response to a query for a RAT capability of the UE. 
 
     
     
       15. The method of  claim 12 , wherein at least one of:
 the non-NB RAT is a wideband evolved universal mobile telecommunications system (UMTS) terrestrial radio access (WB-E-UTRA) RAT or a new radio (NR) RAT, 
 the NB RAT is a NB internet-of-things (IoT) RAT, or 
 the non-NB RAT is associated with a first network node and the NB RAT is associated with a second network node. 
 
     
     
       16. A user equipment (UE) for wireless communication, comprising:
 a memory; and 
 one or more processors coupled to the memory, the one or more processors configured to:
 initiate a communication session establishment procedure to connect using a non-narrowband (NB) radio access technology (RAT), of a plurality of RATs, including the non-NB RAT and an NB RAT, supported by the UE, wherein the non-NB RAT corresponds to a UE radio capability identifier identified during the communication session establishment procedure; 
 determine, during the communication session establishment procedure, whether the UE supports radio capability signaling (RACS) optimization for the non-NB RAT; and 
 transmit, during signaling of the communication session establishment procedure, a communication session establishment message, wherein the communication session message includes the UE radio capability identifier, or does not include the UE radio capability identifier, based at least in part on whether the UE supports RACS optimization for the non-NB RAT. 
 
 
     
     
       17. The UE of  claim 16 , wherein the one or more processors are configured to:
 initiate another communication session establishment procedure to connect using a second RAT; 
 determine whether the UE supports RACS optimization for the second RAT; and 
 transmit a second UE radio capability identifier that applies to the second RAT based at least in part on determining whether the UE supports RACS optimization for the second RAT. 
 
     
     
       18. The UE of  claim 17 , wherein the UE radio capability identifier is a narrowband Internet of Things radio capability identifier and the second UE radio capability identifier is a wideband UE radio capability identifier. 
     
     
       19. The UE of  claim 16 , wherein the UE supports narrowband access and wideband access. 
     
     
       20. The UE of  claim 16 , wherein the UE radio capability identifier indicates that the UE supports:
 a plurality of non-NB RATs, associated with the UE, including the non-NB RAT, 
 a plurality of narrowband RATS, associated with the UE, including the NB RAT, or 
 a plurality of RATs, associated with the UE, including the non-NB RAT and the NB RAT. 
 
     
     
       21. The UE of  claim 16 , UE is one or more processors are further configured to
 provide at least one of the UE radio capability identifier for the non-NB RAT or a second UE radio capability identifier for the NB RAT as the UE radio capability identifier. 
 
     
     
       22. The UE of  claim 21 , wherein the UE is configured to provide the UE radio capability identifier as a particular response to a query for a RAT capability of the UE. 
     
     
       23. The UE of  claim 16 , wherein the one or more processors are further configured to:
 determine that the UE does not support RACS optimization for the non-NB RAT; and 
 transmitting an empty field for the UE radio capability identifier as a particular response to a query for a RAT capability of the UE. 
 
     
     
       24. The UE of  claim 16 , wherein the non-NB RAT is a wideband evolved universal mobile telecommunications system (UMTS) terrestrial radio access (WB-E-UTRA) RAT or a new radio (NR) RAT. 
     
     
       25. The UE of  claim 16 , wherein the NB RAT is a NB internet-of-things (IoT) RAT. 
     
     
       26. The UE of  claim 16 , wherein the non-NB RAT is associated with a first network node and the NB RAT is associated with a second network node. 
     
     
       27. A network node for wireless communication, comprising:
 a memory; and 
 one or more processors coupled to the memory, the one or more processors configured to:
 initiate a communication session establishment procedure to enable a user equipment (UE), supporting a plurality of radio access technologies (RATs) including a narrowband (NB) RAT and a non-NB RAT, to connect using the non-NB RAT, wherein the non-NB RAT corresponds to a UE radio capability identifier identified during the communication session establishment procedure; 
 query a RAT capability of the UE; 
 receive, during signaling of the communication session establishment procedure and as a response to querying the RAT capability of the UE, a communication session establishment message,
 wherein the communication session establishment message includes the UE radio capability identifier, or does not include the UE radio capability identifier, based at least in part on the UE supporting radio capability signaling (RACS) optimization for the non-NB RAT; and 
 
 determine, based at least in part on a result of receiving the communication session establishment message including the UE radio capability identifier, a network capability of the UE. 
 
 
     
     
       28. The network node of  claim 27 , wherein the UE radio capability identifier indicates a set of RATs, supported by the UE, including the non-NB RAT. 
     
     
       29. The network node of  claim 27 , wherein the one or more processors are further configured to:
 receive the UE radio capability identifier as a particular response to a query for a RAT capability of the UE. 
 
     
     
       30. The network node of  claim 27 , wherein at least one of:
 the non-NB RAT is a wideband evolved universal mobile telecommunications system (UMTS) terrestrial radio access (WB-E-UTRA) RAT or a new radio (NR) RAT, 
 the NB RAT is a NB internet-of-things (IoT) RAT, or 
 the non-NB RAT is associated with a first network node and the NB RAT is associated with a second network node.